Final answer:
4.Auscultate the client's apical pulse and obtain a blood pressure. The first intervention a nurse should take when a client complains of dizziness following procainamide administration is to auscultate the client's apical pulse and obtain a blood pressure. This initial assessment helps determine the hemodynamic stability of the client and guides further interventions.
Step-by-step explanation:
If a client being treated with procainamide for a cardiac dysrhythmia complains of dizziness following intravenous administration, the nurse should first assess the client's hemodynamic stability before any other interventions. This is because dizziness can be a sign of a lowered cardiac output which may result from an abnormal heart rate or rhythm, or it can be due to low blood pressure. The appropriate first intervention would be to auscultate the client's apical pulse and obtain a blood pressure. This allows for immediate assessment of the heart rate and rhythm as well as blood pressure, which can give insight into whether the dizziness is related to the patient's cardiac status.
Once these vital signs are obtained, further interventions can be determined based on the findings. Administering additional medications such as nitroglycerin without first assessing the hemodynamic status could potentially worsen the patient's condition if the blood pressure is already low. Similarly, obtaining a 12-lead electrocardiogram is important but not the immediate first step before assessing vital signs.